Strain measurement using a Brillouin optical time domain reflectometer for development of aircraft structure health monitoring system

Takayuki Shimizu; Takashi Yari; Kanehiro Nagai; Nobuo Takeda

doi:10.1117/12.434187

24 July 2001 Strain measurement using a Brillouin optical time domain reflectometer for development of aircraft structure health monitoring system

Takayuki Shimizu, Takashi Yari, Kanehiro Nagai, Nobuo Takeda

Author Affiliations +

Proceedings Volume 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring; (2001) https://doi.org/10.1117/12.434187
Event: 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics, 2001, Newport Beach, CA, United States

Abstract

We conducted theoretical and experimental approaches for applying Brillouin optical time domain reflectometer (BOTDR) to aircraft and spacecraft structure health monitoring system. Firstly, distributed strain was measured by BOTDR under 3-point bending test and a spatial resolution was enhanced up to 0.5m using Brillouin spectrum analysis and processing though the device used in this experiment had a spatial resolution of 2m normally. Secondly, dynamic strain measurement was executed under cyclic loading conditions. Brillouin spectrum measured under dynamic conditions is equivalent to superposed spectrum using many spectra measured under static loading conditions. As the measured spectrum was decomposed into many spectra in static loading state, the strain amplitude and its ratio could be estimated. Thirdly, strain and temperature could be measured independently using combined system of BOTDR and fiber Bragg grating (FBG) with wavelength division multiplexing (WDM). Additionally, the application of BOTDR sensing system was shown for a prototype carbon fiber reinforced plastic (CFRP) liquid hydrogen (LH₂) tank under cryogenic condition.

Citation Download Citation

Takayuki Shimizu, Takashi Yari, Kanehiro Nagai, and Nobuo Takeda "Strain measurement using a Brillouin optical time domain reflectometer for development of aircraft structure health monitoring system", Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); https://doi.org/10.1117/12.434187

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